Hex #559942 or rgb(85,153,66) in RGB space is the tint of grass green. It has hue angle of 106.90 degrees, value = 60 and saturation = 57. #559942 can be obtained by mixing 4 colors: 1 drop of yellow, 2 drops of magenta, 1 drop of cyan, 5 drops of green.
Nearest safe hex - #669933. Below you can see the block with #559942 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #559942 to the mixer and play with it.